"invalid command name 'rand' " in whiteboard plugin

Greetings to everybody.
Whiteboard plugin sends error " invalid command name 'rand' " every time I try to draw text or a circle. If I draw any other primitives, nothing is sent to reciever. The full output follows(for drawing a circle):

invalid command name "rand"
invalid command name "rand"
    while executing
"rand 10000"
    (procedure "create_id" line 4)
    invoked from within
    (procedure "::plugins::wb::circle_b1r" line 17)
    invoked from within
"::plugins::wb::circle_b1r .whiteboard_0.c {1 test@localhost/tkabber} 495 225"
    (command bound to event)

I tried to check "rand" function using tclsh and recieved same answer - invalid command name. Interesting thing that I couldn't evaluate any math built-in function.
My system is : amd64 Debian lenny/sid, tcl/tk 8.4, tkabber 0.10

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